Rock River Arms Complete CAR A4 Upper .458 SOCOM 16" – AR-15 Compatible

The Rock River Arms Complete CAR A4 Upper delivers .458 SOCOM stopping power in a compact 16-inch configuration designed for AR-15 lower receivers. This upper receiver assembly features an A4 flat-top design with integrated Picatinny rail, allowing for versatile optics mounting while chambered in the hard-hitting .458 SOCOM cartridge—ideal for hunting large game or close-range defensive applications where maximum terminal performance is required.

Built with Rock River Arms' precision manufacturing standards, this complete upper includes a 16-inch barrel with carbine-length gas system, bolt carrier group, and charging handle. The forged upper receiver is finished in durable black oxide, and the assembly is ready to install on any mil-spec AR-15 lower. Standard takedown pins allow for quick upper/lower separation for transport or caliber conversion. Requires .458 SOCOM-compatible magazines and ammunition.

• Caliber: .458 SOCOM
• Type: Complete Upper Assembly
• Compatible Lower: Mil-Spec AR-15
• Barrel Length: 16 inches
• Material: Forged aluminum upper receiver
• Finish: Black oxide
• Includes: Bolt carrier group, charging handle
• Installation: Direct fit to mil-spec AR-15 lower, standard takedown pins